Table 2. Operative and post-operative characteristics.

	Single stone	Multiple stones	P value
Number	111	111
Type of f-URS			0.299
Flex-X2 (Fiberoptic)	94	87
Dur-D (Digital)	17	24
Mean operation time(minutes)	44.6±16.8	47.8±22.2	0.229
Mean fluoroscopy time(minutes)	2.1±1.7	2.6±1.5	0.043
Mean hospitalisation time(hours)	20.6±14.5	22.5±16.8	0.387
Post operative complications			0.282
Severe pain (grade 1)	14 (12.6%)	16 (14.4%)
Need for antibiotic change due to fever (grade 2)	0%	5(4.5%)
Gross bleeding (grade 1)	1(0.9%)	2(1.8%)
JJ Catheter migration (grade 3a)	1(0.9%)	1 (0.9%)
JJ Catheter migration (grade 3b)	1 (0.9%)	2 (1.8%)
Postoperative success after single session			0.020
Stone free status	99 (89.2%)	93(83.8%)
Residual stone	12(10.8%)	18(16.2%)
Need for additional procedures	0%	3(2.70%)	0.385
Postoperative success after 3 months	103 (92.7%)	97 (86.4%)	0.016
Stone analysis			0.865
Calcium oxalate monohydrate	28	37
Calcium oxalate dihydrate	11	15
Uric acid	4	2
Cystine	4	7
Struvite	1	2
Mixt	8	13

JJ catheter = Double-J catheter